Buy a green bible mate!
http://www.ebay.com.au/itm/TA22-RA20...#ht_500wt_1288
http://www.ebay.com.au/itm/18RG-18RC...#ht_952wt_1037
They tell you everything you need to know about the engine
Edit: If you don't want to buy one you may be able to download a PDF of one.
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